how to check Ctrl+C status in a mex cpp program

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Mingmin
Mingmin 2025-6-6
评论： Mingmin 2025-6-16
When I compile a c++ example of mex (dlib-20.0\dlib\matlab), an error occurs of the following codes
extern "C" bool utIsInterruptPending();
void check_for_matlab_ctrl_c(){
if (utIsInterruptPending())
throw mex_binding::user_hit_ctrl_c();
}
It seems that there isn't a function named "utIsInterruptPending" in matlab. Then how can we get the Ctrl+C status in a mex file?
  2 个评论
Mingmin
Mingmin 2025-6-8
thank you very much for answering. However, the source code you offered is:
inline static bool utIsInterruptPending() { return false; }
It is not a feature provided by MATLAB (perhaps it used to be).

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采纳的回答

Umeshraja
Umeshraja 2025-6-16
编辑：Umeshraja 2025-6-16
Hi @Mingmin,
I found the utIsInterruptPending function in the libut.lib library, which can be accessed at the following location:
<MATLAB PATH>\extern\lib\win64\mingw64\libut.lib
I assume you press Ctrl+C during a mexCallMATLAB or mexCallMATLABWithTrap. To enable this functionality, make sure to include the following at the top of your MEX-file:
#ifdef __cplusplus
extern "C" {
#endif
extern bool utIsInterruptPending(void);
#ifdef __cplusplus
}
#endif
Further you will need to link against libut.lib, so the MEX command becomes:
mex myFunction.c libut.lib
The following shows a simple MEX-file which uses utIsInterruptPending:
#include "mex.h"
/* utIsInterruptPending prototype */
#ifdef __cplusplus
extern "C" {
#endif
extern bool utIsInterruptPending(void);
#ifdef __cplusplus
}
#endif
void mexFunction(int nlhs, mxArray *plhs[],int nrhs, const mxArray *prhs[]) {
/* Call the PAUSE function in MATLAB */
if (mexCallMATLAB(0, NULL, 0, NULL, "pause")) {
mexErrMsgTxt("Error evaluating callback function!");
}
if (utIsInterruptPending()) { /* <== Check if utIsInterruptPending (someone pressed Ctrl+C) */
mexPrintf("Ctrl+C was pressed!\n");
return;
}
mexPrintf("MEX file completed normally.\n");
}
I hope this helps!

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